1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84456c22e960cde6b156a4eb1f8e7a460dda48a113a80f3655d21ff5f5517e8. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79ea79ec-10d3-4348-bdb7-f448e807d618.json and https://artists.proofprofile.net/proofs/artist/79ea79ec-10d3-4348-bdb7-f448e807d618.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1797167158fbb29b6de2b3e924add13c68909d31eeb4f20fe9b9dc0456a09614. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEN2169773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16fa0760be1b091c026ad4daf433e235ccd3eb85f01f6aade2795db9a98d1098. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMER2106354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728ff3354939ef47566aca27ec9cf12a43d8272c6e71b30e0279a37d3440e44c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEQ2241042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924c771100185e0023ba36e08eba226f35ec2c31958330d2eda99b85793fca2f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2219358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448876977f76189798bf6121100ee94f297d3639a0fc2121bb98dd96d060af99. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2217232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740b2b76892079ce8a20d8ebc0b4c824bfe11288d6f2f8438b58f363ea6c896f. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2217217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c20a08687dcc803353624fdeae11700b94c26476d8a843f83a2f1f70197aec. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2293427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180a9afa7313400a14dcd8f882ac7e9622b6595204c4e3aff01c0fabf7fd8e88. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWT2283732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd58b8966fdb705487d2723028130724f953bd517fac4f2c87c57e8efbfb2c97. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2363836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291b133ef7a096c34d2bf45899d1da94a0f825a8bb38ebbadf6fa2077ebde056. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2293428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1b603e2e6660524fd91827addce4a26a09b283cb8a423d8fb6a1ef74a58694. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6J2363831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88858722942a40b6658e6cf0917ef16289aaac8dc4ca05661ffe3e2ccec2cc66. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6Q2580653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532825e8fa38f1965adad9b790bc09214784ddfd8a1d87e3fdc7c1129d153eb9. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP52557854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9129633b1ecd235f17e6e72b9e22441f4f68522b43f3d03a5ed193da53bfe87c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP52557855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5232570b285dd51c903b8fd0bfa9cef2bb58de8d3fa7ae2d3cefdde2ea5d26. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP52557856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeae6391cc6ea929e430a011a0160f220fc52645db827a9b912c510405a073be. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZRP52557857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdc26a32990d35c418fab46da74f1e75a42282b84042fe49996769fe68ad2d5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGM2221047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdc26a32990d35c418fab46da74f1e75a42282b84042fe49996769fe68ad2d5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGM2221047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdc26a32990d35c418fab46da74f1e75a42282b84042fe49996769fe68ad2d5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAGM2221047.